the pic online and a buddy of mine who has it has the extended ones with an attachment on the top. The ones i got dont have the attachment on the top they just have the threaded shaft like the stock ones, so i am wondering if i am supposed to have ones with the attachment on them.

Someone correct me if I'm wrong but I think there are two different types of the rear 5100s, one has to have and "eye to stem" extension to work and the other one bolts on fine just like the OEM factory shocks with the stem